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Sitting reflectively against a rock, the Skipper sighs and writes out "steak" in the sand as Gilligan comes up and asks how he liked his steaks. At that moment, an object resembling an avocado flies over their heads. The Skipper recognizes it as a hand grenade just before it explodes. Collecting the fragments of it, the Skipper shows it to the Professor and Mr. Howell, who dismiss their plan of action. They decide on surrendering with a white flag, but they've already turned the idea down by time Gilligan comes back with one. Before they can come up with another plan, another grenade flies overhead and explodes near them in the compound. Taking charge,

Mr. Howell proclaims himself General and makes the Skipper Secretary of the Navy and the Professor Chief of Intelligence, but they just humor him along as they search the island. Gilligan, however, gets stuck by a pin when Mr. Howell dived under the table from the grenade and is sent to the girls to treat his wound. They over-eagerly wrap up his entire arm, and Gilligan rejoins the men scouting the island. They're then surprised by gunfire and take cover, but their shooter takes off, abandoning the machine gun. While they're wondering why their attacker left the gun, Gilligan notices a gorilla come out of the woods and throw a grenade at them. They take cover again as the ape takes off again into the jungle.

The Professor deduces that the gorilla watched men fighting with the weapons during World War Two and is now imitating when it saw. Tracking it down to a cave, they realize where the weapons have been coming from. Their plan to sneak the weapon boxes out fails when the gorilla catches them in the act and chases them out of the cave. The Professor then realizes that the gorilla might be stared into immobility, but Gilligan flinches first and the gorilla catches him.

Fleeing the cave, the men are trying to decide how to rescue Gilligan when they hear explosions. In the lagoon, Gilligan has taught the ape to throw the grenades across it where they harmlessly explode. After they're all gone, the only thing left is a strange red disc. The Professor tries stopping them, but it flies off and detonates, creating a huge mushroom cloud beyond the island as the professor relaxes that it wasn't a grenade. A few moments later, Mr. Howell is awarding Gilligan for his bravery when the gorilla returns. Everyone scatters except Gilligan as it reaches down and throws Mary Ann's pie saved for Gilligan into his face. Meanwhile, Gilligan just realizes that the gorilla's aim has improved.

Grenades explode with a perimeter of six to seven feet and can throw fragments up to 200 feet. The Castaways should have experienced fatal injuries due to their proximity to some of the explosions in the episodes.

The Howell's Hut is made up into a military hospital with bottles of alcohol, iodine and Scotch.